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Axelite
Axelite

AX3113 Datasheet

PWM Control 2A Step-Down Converter


AX3113 Datasheet Preview


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AX3113
PWM Control 2A Step-Down Converter
™ GENERAL DESCRIPTION
AX3113 consists of step-down switching regulator with PWM control. These
devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and etc.
AX3113 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to very the duty ratio linearly form 0
up to 100%. An enable function, an over current protect function and short circuit
protect function are built inside, and when OCP or SCP happens, the operation
frequency will be reduced. Also, an internal compensation block is built in to
minimum external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a
diode connected externally, these ICs can function as step-down switching regulators.
They serve as ideal power supply units for portable devices when coupled with the
SOP-8L package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 23V, it is also suitable
for the operation via an AC adapter.
™ FEATURES
- Input voltage4V to 23V
- Output voltage0.8V to Vcc
- Duty ratio0% to 100% PWM control
- Oscillation frequency330KHz typ.
- Current Limit(CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- SOP-8L Pb-Free package.
www.gofotech.com Tel: 0755-6135 8291/8292
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Nov.12, 2007
Datasheet pdf - http://www.DataSheet4U.net/
Page 1

www.DataSheet.co.kr
PWM Control 2A Step-Down Converter AX3113
™ Block Diagram
SW
Vcc
Thermal
Shutdown
Oscillation
Circuit
Reference Voltage
PWM - Switched
Control Circuit
+
-
VEN 110uA
FB
Vss
EN OCSET
™ PIN ASSIGNMENT
The package of AX3113 is SOP-8L; the pin assignment is given by:
Name
Description
( Top View )
FB 1
EN 2
Ocset 3
Vcc 4
AX3113
8 Vss
7 Vss
6 SW
5 SW
SOP8L
FB
EN
OCSET
VCC
SW
Feedback pin
Power-off pin
Hnormal operation(Step-down)
LStep-down operation stopped
(All circuits deactivated)
Add an external resistor to set max
switch output current.
IC power supply pin
Switch pin. Connect external
inductor & diode here.
VSS GND pin
™ ORDER/MARKING INFORMATION
Order Information
AX3113 X X X
Frequency
Package Type Packing
Blank : 330Khz S: SOP-8L
Blank : Tube
A : Taping
Logo
Top Marking
AX 3113
XXXXX
Part number
ID code: internal
WW: 01~52
Year : 06 = 2006
www.gofotech.com Tel: 0755-6135 8291/8292
Axelite Confidential Materials, do not copy or distribute without written consent.
2/8
Rev.1.0 Nov.12, 2007
Datasheet pdf - http://www.DataSheet4U.net/
Page 2

www.DataSheet.co.kr
PWM Control 2A Step-Down Converter AX3113
™ Absolute Maximum Ratings (at Ta=25)
Characteristics
Symbol
Rating
Unit
VCC Pin Voltage
Feedback Pin Voltage
ON/OFF Pin Voltage
Switch Pin Voltage
Power Dissipation
VCC VSS - 0.3 to VSS + 23
V
VFB VSS - 0.3 to VCC
V
VEN VSS - 0.3 to VCC + 0.3
V
VSW VSS - 0.3 to VCC + 0.3
V
PD Internally limited mW
Storage Temperature Range
TST -40 to +150
Operating Junction Temperature Range TJ -20 to +125
Operating Supply Voltage
VOP 4 to 23
V
Output Current
IOUT 0 to 2
A
Thermal Resistance from Junction to case
θJC
25 /W
Thermal Resistance from Junction to ambient θJA
70 /W
Note : θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer).
™ Electrical Characteristics (VIN = 12V, Ta=25, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ Max Units
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
OCSET pin bias current
Switch Current
Line Regulation
Load Regulation
Oscillation Frequency
Switching Rising Time
Switching Falling Time
EN Pin Logic input
threshold voltage
EN Pin Input Current
Internal MOSFET RDSON
Efficiency
VFB IOUT=0.1A
ICCQ VFB=1.2V force driver off
IFB IOUT=0.1A
ISD VEN =0V
IOCSET
ISW
VOUT/VOUT VCC = 5V~23V, IOUT=0.2A
VOUT/VOUT IOUT = 0.1 to 2A
FOSC SW pin
Tr IOUT=1.5A
Tf IOUT=1.5A
VSH High (regulator ON)
VSL Low (regulator OFF)
ISH VEN=2.5V (ON)
ISL
RDSON
EFFI
VEN=0.3V (OFF)
VCC=5V, VFB=0V
VCC=12V, VFB=0V
VCC = 12V, IOUT = 1A
VOUT = 5V IOUT = 2A
0.784
-
-
-
95
2.3
-
-
260
-
-
2.0
-
-
-
-
-
-
0.800 0.816
35
0.1 0.5
2 10
110 125
--
12
0.2 0.5
330 400
15 -
15 -
--
- 0.8
20 -
-10 -
200 240
100 120
92 -
91
V
mA
uA
uA
uA
A
%
%
KHz
ns
ns
V
uA
uA
m
%
www.gofotech.com Tel: 0755-6135 8291/8292
Axelite Confidential Materials, do not copy or distribute without written consent.
3/8
Rev.1.0 Nov.12, 2007
Datasheet pdf - http://www.DataSheet4U.net/
Page 3
Part Number AX3113
Manufactur Axelite
Description PWM Control 2A Step-Down Converter
Total Page 9 Pages
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